Intermolecular London Dispersion Interactions of Azobenzene Switches for Tuning Molecular Solar Thermal Energy Storage Systems
Artikel i vetenskaplig tidskrift, 2019

The performance of molecular solar thermal energy storage systems (MOST) depends amongst others on the amount of energy stored. Azobenzenes have been investigated as high-potential materials for MOST applications. In the present study it could be shown that intermolecular attractive London dispersion interactions stabilize the (E)-isomer in bisazobenzene that is linked by different alkyl bridges. Differential scanning calorimetry (DSC) measurements revealed, that this interaction leads to an increased storage energy per azo-unit of more than 3 kcal/mol compared to the parent azobenzene. The origin of this effect has been supported by computation as well as X-ray analysis. In the solid state structure attractive London dispersion interactions between the C−H of the alkyl bridge and the π-system of the azobenzene could be clearly assigned. This concept will be highly useful in designing more effective MOST systems in the future.

noncovalent interactions


molecular switches

thermal energy storage

London dispersions


Anne Kunz

Justus-Liebig-Universität Gießen

Andreas H. Heindl

Justus-Liebig-Universität Gießen

Ambra Dreos

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Zhihang Wang

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Kasper Moth-Poulsen

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Jonathan Becker

Justus-Liebig-Universität Gießen

Hermann A. Wegner

Justus-Liebig-Universität Gießen


21926506 (eISSN)

Vol. 84 8 1145-1148


Övrig annan teknik

Annan fysik




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